Cat has ostemyelitis on ankle

[Applecart12]

My cat was injured 6 weeks ago on the inside of his ankle, right on the bone. The jury's still out on how he got it, but after a more conservative approach by the vet, 3 course of antibiotics, cone, an xray this week had diagnosed osteomyelitis, with a small sequestra, as the wound was not healing.
It is currently bandaged and we are waiting for the cultures to come back to determine the correct antibiotics to give. In the interim he has been on synolux 250 mg twice a day, and Clyndamycin 75 mg. The wound has been debrided. He's generally well in himself. He's had diarrhea so we have had to stop the metacam.
Vet says the sequestra should either reattach or be absorbed by the body. However my reading suggests that the sequestra should be removed as the body will still think it is a foreign body and attack itself.

This is day three of his bandage and he's flickering his foot a lot more so not sure if I should take him to the vet to check? He's due a bandage change on Monday.

I've asked to be referred to a specialist vet clinic, but has any one been through similar and can provide some advice?

I dont know about cats but I look after humans with this problem. They dont always need surgical debridement. They do need at least 6 weeks of antibiotics then repeat xray and then surgical debridement if the problem persists. Each case is different depending on age, health etc.
A youngish, healthy cat should recover after antibiotics without surgery I would think.
But a second opinion never hurts.

Thank you, that is reassuring that surgery isn't always necessary. Your suggestion is what the vet is proposing (but I was a bit worried as he'd already been on 3 courses of antibiotics and it had already been 6 weeks)